Samuel fiskb



(No Model.)

S. FISKE.

' BOILER FURNACE. No. 342,434. Patented Mfay 5 1886.

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nace-walls, as shown at 1).

UNITED STATES PATENT OFFICE.

SAMUEL F ISKE, OF NEW YORK, N. Y.

BOILER-FURNACE.

EPECIPICATION forming part of Letters Patent No. 342. dated y 1386.

Application filed February 17, 1886. Serial No. 192 195. (No model.)

T 0 all whom, it may concern:

Be it known that I, SAMUEL FIsKE, a citizen of the United States of North America, and a resident of the city, county, and State of New York, have invented a new and useful Improvement in Boiler-Furnaces, of which the following is a specification.

The object of this invention is to provide an improved furnace for the utilization of wet bagasse as a fuel under boilers.

The invention consists in enlarging the rear end of the furnace or combustion-chamber and in the application of a damper at the point of greatest enlargement, for the purposes as hereinafter set forth.

Reference is to be had to the accompanying drawings, forming part of this specification,in which similar letters of reference indicate corresponding parts in all the figures.

' Figure 1 is a sectional side elevation of my improved boiler-furnace with boilers in position. Fig. 2 is a plan thereof. Fig. 3 is a sectional end elevation of the furnace with boilers in position.

In the drawings, A represents the side walls, 13 the front wall, and G the bridge-wall, of the furnace. The horizontal cylinder-boilers D are shown suspended in the upper part of the furnace by hangers a from iron beams E, which are laid across the tops of the side walls, and the lower and upper boilers are connected with each other in pairs by connecting tubes or necks F. Preferably the boilers of the lower range are shorter than those above, as shown, whereby a larger combustionchamber is bad directly over the grate G. Further support is given to the boilers by the front and rear fur- The grate-bars G are designed to be set close enough together to hold the bagasse, which will be fed upon them through hoppers H in the top of. the furnace. A blast-pipe, I, is entered into the ash-pit G to introduce a continuous blast of air from a suitable source. The fire bridge-wall C is made high, in order to increase the capacity of the fireplace, and is sloped upward from front to rear, as shown at c, for the same reason, and the hearth K is made low relatively to the boilers to assure sufficient room for the combustion of the great volume of gases arising from the burning of wet bagasse. Though some of these features may not be new, the effective combination of them is not thought to have been before made.

The special features of my improved furnace are the enlargement of the combustionchamber at the throat, made by sloping down the hearth K,at the rear end thereof, as shown at d, and the location of the damper M at the point of greatest enlargement of said chamber or just beyond it.

The damper M is suspended by a chain, f, passed over a sheave, 9, whose arbor is jour-v naled in standard. h, which is secured on the rear pair of beams, E, and on the other end of the chain is a counter-balance, m. The damper is adjusted so as to be moved up and down at the throat of the furnace or the point of its connection with the horizontal flue leading to the smoke-stack 0, so that when it is closed nearly down, as indicated, it will operate to prevent any serious escape or loss of hot gases up the said stack, and to retain them nearly all about the boilers under pressure that facilitates their intermingling and combustion and exaltstheir temperature.

In operating this furnace, a fire is built on the grate, a blast applied through the blastpipe, and bagasse is then introduced through the hopper or hoppers.

The capacity of the furnace is designed to be sufficient for the complete combustion within it of the air and gases arising from the fireplace; but as time is an important element in the matter, they should be retained in the furnacelong enough for complete combustion; and it is also desirable that none of the heated gases should escape into the stack until their temperature has been reduced by contact with or radiation to the boiler or furnace walls to about that of the steam hence the damper is located where shown, and notin or on the stack itself, in order to limit the length of the combustion-chamber to that of the boiler, to prevent it from extending practically up into the Smokestack and thus rendering useless for generation of steam a greater portion of the fuel.

It will be seen that were the combustionchamber to be of equal area in cross-section throughout, the nearly complete closing of the damper would cause the current of burning gases from the furnace to be so suddenly arrested as to cause an almost instant violent reactionary current, with probable explosion before the gases could adjust themselves to the conditions. This is provided against by the enlargement of the furnace, as hereinbefore referred to, whereby at this point an excess of room is bad for the sufficiently gradual and safe accommodation of the current of gases to the. retardation of its flow when the damper is closed, or nearly so.

WVere the damper on the top of the stack, according to the usual method, the enlargement of the combustion-chamber, as shown, would not be requisite, for in such cases there is always an excess of room in the stack for the current of escaping gases to safely adjust itself to sudden arrest.

The use of dry bagasse for fuel involves no unusual form of boiler-furnace; but to successfully use wet bagasse as a fuel, as it is delivered from the rolls full of gas-generating moisture, the form of furnace herein shown and described has been found the most effective and economical known.

The boilers herein shown are well arranged and adapted for use with this furnace; but boilers of other styles can be used with excellent results. The enlargement of the furnace may be made anywhere between the bridge-wall and the rear end of the hearth,

provided it be made below the hearths level. A large pit or pocket, for instance, may be made in the hearth.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In a boiler-furnace for burning wetbagasse, the eombination,with the boiler-furnace walls, of cross-beams supported thereby, a boiler or boilers suspended by said cross-beams, a comlmstion-chamber beneath the boiler or boilers, locally enlarged below the horizontal line of the hearth, a bridge-wall extending above the grate and sloping upward from front to rear, hoppers for delivering fuel upon the. grate, a blastpipe for conducting air under pressure to pass through the fuel on the grate, and a sliding damper arranged to operate at the rear of the eombuslion-chamber to retain the products of combustion under pressure, ifdesired, in and only in the combustion-chamber and only when the forced blast is applied, substantially as set forth.

In testimony that Iclaim the foregoing as my invention 1 have signed my name, in presence of two witnesses, this 10th day of February, 1886.

SAMUEL FISKE.

Witnesses:

EDWIN W. Frsnn, HUGH J. BARRON. 

